Yamaha F 40 User Guide

							 
Operation 
45 
from marine growth and corrosion which
could damage the power trim and tilt 
mechanism. 
EMU28041 
Procedure for tilting down (manual 
and hydro tilt models) 
1. Release the tilt lock lever.
2. Hold the rear of the top cowling with one
hand, tilt the outboard motor up slightly
and pull out the tilt support knob or re-
turn the tilt support lever.
3. Slowly tilt the outboard motor down.
4. Place the tilt lock lever in the lock posi-
tion. 
EMU28055 
Procedure for tilting down (power 
trim and tilt models / power tilt 
models) 
1. Push the power trim and tilt switch / pow-
er tilt switch “” (up) until the outboard
motor is supported by the tilt rod and the
tilt support lever / tilt support knob be-
comes free.
2. Release the tilt support lever or pull out
the tilt support knob.
3. Push the power trim and tilt switch / pow-
er tilt switch “” (down) to lower the out-
board motor to the desired position.
ZMU04069
ZMU04070
ZMU04071
ZMU04072 
						

							 
Operation 
46 
EMU28060 
Cruising in shallow water 
The outboard motor can be tilted up partially
to allow operation in shallow water. 
EMU28080 
Hydro tilt models 
The outboard motor can be tilted up partially
to allow operation in shallow water.
WARNING
 
EWM00270  
 
Place the gear shift in neutral before us-ing the shallow water cruising system. 
 
Run the boat at the lowest possible
speed when using the shallow water
cruising system. 
 
Use extra care when operating in re-
verse. Too much reverse thrust can
cause the outboard motor to lift out of
the water, increasing the chance of ac-
cident and personal injury. 
 
Return the outboard motor to its normal
position as soon as the boat is back in 
deeper water.
CAUTION:
 
ECM00260  
Do not tilt the outboard motor up so that
the cooling water inlet on the lower unit is
above the surface of the water when set-
ting up for and cruising in shallow water.
Otherwise severe damage from overheat- 
ing can result. 
EMU28174 
Procedure for hydro tilt models 
1. Place the gear shift lever in neutral.
DN
ZMU01936
UPDN
DN
ZMU04073
ZMU04074 
						

							 
Operation 
47 
2. Pull the tilt lock lever up to the release
position.
3. Slightly tilt the outboard motor up to the
desired position and push the tilt lock le-
ver down to the lock position.
4. To return the outboard motor to the nor-
mal running position, pull the tilt lock le-
ver up to the release position and slowly
tilt the outboard motor down.
5. Push the tilt lock lever down to the lock
position. 
EMU28090 
Power trim and tilt models / power tilt 
models 
The outboard motor can be tilted up partially
to allow operation in shallow water.
WARNING
 
EWM00660  
 
Place the gear shift in neutral before
setting up for shallow water cruising. 
 
Return the outboard motor to its normal
position as soon as the boat is back in 
deeper water.
CAUTION:
 
ECM00260  
Do not tilt the outboard motor up so that
the cooling water inlet on the lower unit is
above the surface of the water when set-
ting up for and cruising in shallow water.
Otherwise severe damage from overheat- 
ing can result. 
EMU28185 
Procedure for power trim and tilt / power
tilt models 
1. Place the remote control lever / gear
shift lever in neutral.
N
ZMU03087
ZMU04075
ZMU04076 
						

							 
Operation 
48 
2. Slightly tilt the outboard motor up to the
desired position using the power trim
and tilt switch / power tilt switch.3. To return the outboard motor to the nor-
mal running position, press the power
trim and tilt switch / power tilt switch and
slowly tilt the outboard motor down. 
EMU28192 
Cruising in other conditions 
Cruising in salt water 
After operating in salt water, flush the cooling
water passages with fresh water to prevent
them from becoming clogged with salt de-
posits.
NOTE:
 
For cooling system flushing instructions, see 
page 50. 
Cruising in turbid water 
Yamaha strongly recommends that you use
the optional chromium-plated water pump kit
(not available for some models) if you use
the outboard motor in turbid or muddy water
conditions.
N
ZMU03525
UP
ZMU01935
UPDN
UP
ZMU04077 
						

							 
49 
Maintenance 
EMU31480 
Specifications
NOTE:
 
“(AL)” stated in the specification data below
represents the numerical value for the alumi-
num propeller installed.
Likewise, “(SUS)” represents the value for
stainless steel propeller installed and “(PL)” 
for plastic propeller installed. 
EMU28218 
Dimension: 
Overall length: 
F40MH 1332 mm (52.4 in)
F40TR 700 mm (27.6 in)
Overall width: 
378 mm (14.9 in)
Overall height S: 
1217 mm (47.9 in)
Overall height L: 
1340 mm (52.8 in)
Transom height S: 
410 mm (16.1 in)
Transom height L: 
533 mm (21.0 in)
Weight (without propeller) S: 
F40MH 83.0 kg (183 lb)
Weight (without propeller) L: 
F40MH 87.0 kg (192 lb)
F40TR 89.0 kg (196 lb) 
Performance: 
Full throttle operating range: 
5000–6000 r/min
Maximum output: 
29.4 kW@5500 r/min (40 HP@5500 
r/min)
Idling speed (in neutral): 
850  
± 
50 r/min 
Engine: 
Type: 
4-stroke LDisplacement: 
747.0 cm 
3
 
 (45.58 cu.in)
Bore  
× 
 stroke: 
65.0  
× 
 75.0 mm (2.56  
×  
 2.95 in)
Ignition system: 
CDI
Spark plug with resistor (NGK): 
DPR6EA-9
Spark plug gap: 
0.8–0.9 mm (0.031–0.035 in)
Control system: 
F40MH Tiller
F40TR Remote control
Starting system: 
F40MH Manual
F40TR Electric
Starting carburetion system: 
Prime start
Valve clearance (cold engine) IN: 
0.15–0.25 mm (0.0059–0.0098 in)
Valve clearance (cold engine) EX: 
0.25–0.35 mm (0.0098–0.0138 in)
Min. cold cranking amps (CCA/SAE): 
F40TR 380.0 A
Min. marine cranking amps (MCA/ABYC): 
F40TR 502.0 A
Min. reserve capacity (RC/SAE): 
F40TR 124 minutes
Alternator output for battery DC: 
15.0 A 
Drive unit: 
Gear positions: 
Forward-neutral-reverse
Gear ratio: 
2.00 (26/13)
Trim and tilt system: 
F40MH Hydro tilt
F40TR Power trim and tilt
Propeller mark: 
G 
Fuel and oil: 
						

							 
Maintenance 
50 
Recommended fuel: 
Regular unleaded gasoline
Min. pump octane: 
86
Fuel tank capacity: 
25 L (6.60 US gal) (5.50 Imp.gal)
Recommended engine oil: 
4-stroke outboard motor oil
Engine oil grade API: 
API SE, SF, SG, SH, SJ, SL
Engine oil type SAE: 
SAE10W30 or SAE10W40
Lubrication: 
Wet sump
Engine oil quantity (excluding oil filter): 
2.0 L (2.11 US qt) (1.76 Imp.qt)
Recommended gear oil: 
Hypoid gear oil SAE#90
Gear oil quantity: 
430.0 cm 
3
 
 (14.54 US oz) (15.17 
Imp.oz) 
Tightening torque for engine: 
Spark plug: 
18.0 Nm (13.3 ft-lb) (1.84 kgf-m)
Propeller nut: 
40.0 Nm (29.5 ft-lb) (4.08 kgf-m)
Engine oil drain bolt: 
18.0 Nm (13.3 ft-lb) (1.84 kgf-m)
Engine oil filter: 
18.0 Nm (13.3 ft-lb) (1.84 kgf-m) 
EMU28222 
Transporting and storing 
outboard motor
WARNING
 
EWM00690  
 
Leaking fuel is a fire hazard. When
transporting and storing the outboard
motor, close the air vent screw and fuel
cock to prevent fuel from leaking. 
 
USE CARE when transporting fuel tank,whether in a boat or car. 
 
DO NOT fill fuel container to maximum
capacity. Gasoline will expand consid-
erably as it warms up and can build up
pressure in the fuel container. This can
cause fuel leakage and a potential fire 
hazard.
WARNING
 
EWM00700  
Never get under the lower unit while it is
tilted, even if a motor support bar is used.
Severe injury could occur if the outboard 
motor accidentally falls.
CAUTION:
 
ECM00660  
Do not use the tilt support lever or knob
when trailering the boat. The outboard
motor could shake loose from the tilt sup-
port and fall. If the motor cannot be trail-
ered in the normal running position, use
an additional support device to secure it 
in the tilt position. 
The outboard motor should be trailered and
stored in the normal running position. If there
is insufficient road clearance in this position,
then trailer the outboard motor in the tilt po-
sition using a motor support device such as
a transom saver bar. Consult your Yamaha
dealer for further details. 
EMU28241 
Storing outboard motor 
When storing your Yamaha outboard motor
for prolonged periods of time (2 months or
longer), several important procedures must
be performed to prevent excessive damage.
It is advisable to have your outboard motor
serviced by an authorized Yamaha dealer
prior to storage. However, you, the owner,
with a minimum of tools, can perform the fol- 
						

							 
Maintenance 
51 
lowing procedures.
CAUTION:
 
ECM01080  
 
To prevent problems which can be
caused by oil entering the cylinder from
the sump, keep the outboard motor in
the attitude shown when transporting
and storing it. If storing or transporting
the outboard motor on its side (not up-
right), put it on a cushion after draining
the engine oil. 
 
Do not place the outboard motor on its
side before the cooling water has
drained from it completely, otherwise
water may enter the cylinder through
the exhaust port and cause engine trou-
ble. 
 
Store the outboard motor in a dry, well- 
ventilated place, not in direct sunlight. 
EMU28303 
Procedure 
EMU28372 
Flushing in a test tank 
1. Wash the outboard motor body using
fresh water. For further information, see
page 54.
2. Fill the fuel tank with fresh fuel and add
one ounce of “Yamaha Fuel Conditioner
and Stabilizer” (Part No. LUB-FUELC-
12-00) to each gallon of fuel.
NOTE:
 
The use of “Yamaha Fuel Conditioner and
Stabilizer” eliminates the need to drain the
fuel system. Consult your Yamaha dealer or
other qualified mechanic if the fuel system is 
to be drained instead.
3. Remove the engine top cowling and si-
lencer cover.
4. Install the outboard motor on the test
tank.
5. Fill the tank with fresh water to above the
level of the anti-cavitation plate.
CAUTION:
 
ECM00300  
Do not run the engine without supplying
it with cooling water. Either the engine
water pump will be damaged or the en-
ZMU04078
ZMU04079
 
1. Water surface
2. Lowest water level
ZMU02051
1
2 
						

							 
Maintenance 
52 
gine will be damaged from overheating.
Before starting the engine, be sure to
supply water to the cooling water passag- 
es.
CAUTION:
 
ECM00290  
If the fresh water level is below the level
of the anti-cavitation plate, or if the water
supply is insufficient, engine seizure may 
occur. 
6. Cooling system flushing is essential to
prevent the cooling system from clog-
ging up with salt, sand, or dirt. In addi-
tion, fogging of the engine is mandatory
to prevent excessive engine damage
due to rust. Perform the flushing and
fogging at the same time.
WARNING
 
EWM00090  
 
Do not touch or remove electrical parts
when starting or during operation. 
 
Keep hands, hair, and clothes away
from the flywheel and other rotating 
parts while the engine is running. 
7. Run the engine at a fast idle for 10–15
minutes in neutral position.
8. Just prior to turning off the engine, quick-
ly spray “Yamaha Stor-Rite Engine
Fogging Oil” (Part No. LUB-STRRT-12-
00) alternately into each carburetor or
the fogging hole of the silencer cover, if
equipped. When properly done, the en-
gine will smoke excessively and almost
stall.
9. Remove the outboard motor from the
test tank.
10. Drain the cooling water completely out
of the motor. Clean the body thoroughly.
11. Install the silencer cover/cap and top
cowling. 
EMU28401 
Lubrication 
1. Grease the spark plug threads and in-
stall the spark plug(s) and torque to
proper specification. For information on
spark plug installation, see page 58.
2. Change the gear oil. For instructions,
see page 65. Inspect the oil for the pres-
ence of water that indicates a leaky seal.
Seal replacement should be performed
by an authorized Yamaha dealer prior to
use.
3. Grease all grease fittings. For further de-
tails, see page 58. 
EMU28421 
Cleaning and anticorrosion 
measures 
1. Wash down the exterior of the outboard
motor with fresh water and dry off com-
pletely.
2. Spray the outboard motor exterior with
“Yamaha Silicone Protectant” (Part No.
LUB-SILCNE-13-00).
3. Wax the cowling with a non-abrasive
wax such as “Yamaha Silicone Wax”
(Part No. ACC-11000-15-02). 
EMU28430 
Battery care
WARNING
 
EWM00330  
Battery electrolytic fluid is dangerous; it
contains sulfuric acid and therefore is
poisonous and highly caustic.
Always follow these preventive mea-
sures: 
 
Avoid bodily contact with electrolytic
fluid as it can cause severe burns or
permanent eye injury. 
 
Wear protective eye gear when han- 
						

							 
Maintenance 
53 
dling or working near batteries.
Antidote (EXTERNAL): 
 
SKIN - Flush with water. 
 
EYES - Flush with water for 15 minutes
and get immediate medical attention.
Antidote (INTERNAL): 
 
Drink large quantities of water or milk
followed by milk of magnesia, beaten
egg, or vegetable oil. Get immediate
medical attention.
Batteries also generate explosive hydro-
gen gas; therefore, you should always
follow these preventive measures: 
 
Charge batteries in a well-ventilated ar-
ea. 
 
Keep batteries away from fire, sparks,
or open flames (for example: welding
equipment, lighted cigarettes, and so
on.) 
 
DO NOT SMOKE when charging or han-
dling batteries.
KEEP BATTERIES AND ELECTROLYTIC 
FLUID OUT OF REACH OF CHILDREN. 
Batteries vary among manufacturers. There-
fore the following procedures may not al-
ways apply. Consult your battery
manufacturer’s instructions.
Procedure
1. Disconnect and remove the battery from
the boat. Always disconnect the black
negative cable first to prevent the risk of
shorting.
2. Clean the battery casing and terminals.
Fill each cell to the upper level with dis-
tilled water.
3. Store the battery on a level surface in a
cool, dry, well-ventilated place out of di-
rect sunlight.
4. Once a month, check the specific gravity
of the electrolyte and recharge as re-
quired to prolong battery life.
 
EMU28442 
Flushing power unit 
Perform this procedure right after operation
for the most thorough flushing.
CAUTION:
 
ECM01530  
Do not perform this procedure while the
engine is running. The water pump may
be damaged and severe damage from 
overheating can result. 
1. After shutting off the engine, unscrew
the garden hose connector from the fit-
ting on the bottom cowling.
2. Screw the garden hose adapter onto a
garden hose, which is connected to a
fresh water supply, and then connect it
to the garden hose connector.
3. With the engine off, turn on the water tap 
1. Fitting
2. Garden hose connector
3. Garden hose adapter
1
2
3
ZMU04080 
						

							 
Maintenance 
54 
and let the water flush through the cool-
ing passages for about 15 minutes. Turn
off the water and disconnect the garden
hose adapter from the garden hose con-
nector.
4. Reinstall the garden hose connector
onto the fitting on the bottom cowling.
Tighten the connector securely.
CAUTION:
 
ECM00540  
Do not leave the garden hose connector
loose on the bottom cowling fitting or let
the hose hang free during normal opera-
tion. Water will leak out of the connector
instead of cooling the engine, which can
cause serious overheating. Be sure the
connector is tightened securely on the fit- 
ting after flushing the engine.
NOTE:
 
 
When flushing the engine with the boat in
the water, tilting up the outboard motor un-
til it is completely out of the water will
achieve better results. 
 
For cooling system flushing instructions, 
see page 50. 
EMU28450 
Cleaning the outboard motor 
After use, wash the exterior of the outboard
motor with fresh water. Flush the cooling
system with fresh water.
NOTE:
 
For cooling system flushing instructions, see 
page 50. 
EMU28460 
Checking painted surface of motor 
Check the motor for scratches, nicks, or flak-
ing paint. Areas with damaged paint are
more likely to corrode. If necessary, clean
and paint the areas. A touch-up paint is avail-
able from your Yamaha dealer. 
EMU28486 
Periodic maintenance
WARNING
 
EWM01070  
Be sure to turn off the engine when you
perform maintenance unless otherwise
specified. If you or the owner is not famil-
iar with machine servicing, this work
should be done by your Yamaha dealer or 
other qualified mechanic.
Maintenance, replacement, or repair of
the emission control devices and sys-
tems may be performed by any marine
engine repair establishment or individual.
All warranty repairs, however, including
those to the emission control system,
must be performed by an authorized
Yamaha marine dealership. 
A service manual is available for purchase
through your Yamaha dealer for owners who
have the mechanical skills, tools, and other
equipment necessary to perform mainte-
nance not covered by this owner’s manual. 
EMU28510 
Replacement parts 
If replacement parts are necessary, use only
genuine Yamaha parts or parts of the same
type and of equivalent strength and materi-
als. Any part of inferior quality may malfunc-
tion, and the resulting loss of control could
endanger the operator and passengers.
ZMU02550